/proc/thread-self/root/proc/self/root/proc/self/task/21/root/sys/fs/cgroup
This explorer reads the filesystem of the server it runs on, so /workspace/user isn't present here. Browsing and the terminal still work against this server's own disk from /.
254:0 rbytes=63951360 wbytes=0 rios=1600 wios=0 dbytes=0 dios=0